1263305f0c
RH0 was deprecated by RFC 5095. While most of the code had been disabled by #if 0 already, leave a bit of infrastructure for possible RH2 code and a log message under BURN_BRIDGES in case a user still tries to send RH0 packets. Reviewed by: gnn (a bit back, earlier version)
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/vimage.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/vinet6.h>
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/*
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* proto - is unused
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*/
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int
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route6_input(struct mbuf **mp, int *offp, int proto)
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{
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INIT_VNET_INET6(curvnet);
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struct ip6_hdr *ip6;
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struct mbuf *m = *mp;
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struct ip6_rthdr *rh;
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int off = *offp, rhlen;
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struct ip6aux *ip6a;
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ip6a = ip6_findaux(m);
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if (ip6a) {
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/* XXX reject home-address option before rthdr */
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if (ip6a->ip6a_flags & IP6A_SWAP) {
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V_ip6stat.ip6s_badoptions++;
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m_freem(m);
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return IPPROTO_DONE;
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}
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}
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#ifndef PULLDOWN_TEST
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IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
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ip6 = mtod(m, struct ip6_hdr *);
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rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
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#else
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ip6 = mtod(m, struct ip6_hdr *);
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IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
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if (rh == NULL) {
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V_ip6stat.ip6s_tooshort++;
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return IPPROTO_DONE;
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}
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#endif
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/*
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* While this switch may look gratuitous, leave it in
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* in favour of RH2 implementations, etc.
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*/
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switch (rh->ip6r_type) {
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#ifndef BURN_BRIDGES
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case IPV6_RTHDR_TYPE_0:
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/*
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* According to RFC 5095, 3. Deprecation of RH0,
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* we must handle RH0 like the default (unknown
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* routing header type) case.
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*/
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/* FALLTHROUGH */
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#endif
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default:
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/* Unknown routing header type. */
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if (rh->ip6r_segleft == 0) {
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rhlen = (rh->ip6r_len + 1) << 3;
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break; /* Final dst. Just ignore the header. */
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}
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V_ip6stat.ip6s_badoptions++;
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icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
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(caddr_t)&rh->ip6r_type - (caddr_t)ip6);
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return (IPPROTO_DONE);
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}
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*offp += rhlen;
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return (rh->ip6r_nxt);
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}
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